Performance Characteristics of Ocean Thermal Energy Conversion cycle according to various Composition Ratios of R32/R152a

Abstract

It has been found that chlorofluorocarbon (CFCs) and hydrochlorofluorocarbon (HCFCs), which have been used since 1930, cause ozone layer depletion owing to their strong thermodynamics characteristics. This study investigated the performance characteristics of ocean thermal energy conversion (OTEC) cycles when using existing mixed refrigerants for OTEC. Among the various available mixed refrigerants for industrial heat pumps, R32/R152a is used even in OTEC systems. For our simulations, R32/R152a was used in the existing closed cycle, regeneration cycle, and Kalina cycle, in which only ammonia and water are used as the mixed refrigerant.The temperature of the warm heat source was kept at 26°C, and that of the cold heat source was kept at 5°C. The cycles were analyzed for R32/R152a at composition ratios of 100:0, 67:33, 50:50, 33:67, and 0:100. characteristics of ocean thermal energy conversion (OTEC) cycles when using existing mixed refrigerants for OTEC. Among the various available mixed refrigerants for industrial heat pumps, R32/R152a is used even in OTEC systems. For our simulations, R32/R152a was used in the existing closed cycle, regeneration cycle, and Kalina cycle, in which only ammonia and water are used as the mixed refrigerant.The temperature of the warm heat source was kept at 26°C, and that of the cold heat source was kept at 5°C. The cycles were analyzed for R32/R152a at composition ratios of 100:0, 67:33, 50:50, 33:67, and 0:100.